The Grand Canyon turned 100 this week, or we should say the National Park turned 100, as the Grand Canyon is 70 million years old. To celebrate, a park ranger placed a typewriter at Plateau Point in the Grand Canyon and invited hikers to record their thoughts. After a six-mile hike down into the canyon, the typewriter sat waiting for them. Hikers left 76 messages: "Geologic pilgrimage," "parks are really powerful places," and "perfection," were some of the messages. And the single $5 typewriter from Goodwill found itself on media all over the country. Click here to read the NPR story.